You vastly understate the power of the US Federal government when you compare it to the EU, and understate the power of German states. I don't know what you mea

You vastly understate the power of the US Federal government when you compare it to the EU, and understate the power of German states. I don't know what you mean by "evidence" here. We're not discussing some sort of experimental result. We're discussing the basics of the American and German constitutions.